Step 1

In a large bowl with an electric mixer, beat peanut butter and cream cheese until smooth. Beat in confectioners' sugar and vanilla until smooth. Fold in 3 cups whipped topping and 3/4 cup peanut butter cups. Spoon mixture into crust. Top with remaining whipped topping and remaining peanut butter cups.

Step 2

Chill 8 hours or overnight, until firm.